The popular children's toy Etch-a-Sketch has motivated the invention of a new method for creating electronic circuits that are so small, they approach the spacing between atoms. The interface between two normally insulating materials, strontium titanate and lanthanum aluminate, can be switched between the insulating and conducting state with the use of the sharp metallic probe of an atomic-force microscope. By "sketching" this probe in various patterns, one can create electronic structures with remarkably diverse properties. This new nanoelectronics platform may lead to new ultra high- density information storage and processing and sensing applications, create new types of particles (called Majorana fermions), and meet the challenge of quantum computation.